One who studies and practices the art of demonology. An individual who specializes in the removal of evil or demonic forces from a given environment using the art of demonology. One who brings demonic forces out of their slumber to be cast away. Someone who uses the art of demonology to incantate demons for ones use in battling them.
Demonology is the systematic study of demons or beliefs about demons.http://dictionary.reference.com/browse/demonology "Demonology" at Dictionary.com Unabridged, (v 1.1) Random House, Inc., retreived January 29 2007.